Carbureter



1. S. GQLDBENG AND N. Nl. ANDERSON.

CARBURETEB.

. APPLICATION FILED MAR. 6. I9II. 1,355,960. Patented Oct. 19, 1920.

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JOHN S. GOLDIBERG AND RAYMOND M. ANDERSON, OF CHICAGO, ILLINOIS, ,ASSIGNORS T0 STROMBERG MOTOR'DEVICES COMIANY, 0F CHICAGO, ILLINOIS, A CORPORA- TIoN or ILLINOIS.

To all 'whom z't may concern:

Be it known that we, JOHN S. GoLnBERG and RAYMOND M. ANDERSON, both citizens of the United' States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Carbureters, of which the foll lowingis a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of thisspecification.

Our invention relates to carbureters and contemplates improved means for feeding the fuel.

As is well-known in the art, it has been the practice in many instances to provide a main air inlet and a main fuel inlet, and, in addition, an auxiliary air inlet and as sociated fuel inlet, the latter inlets coming into play only after the engine has created a suflicient suction in the mixing chamber, Devices somewhat like this but omitting the auxiliary fuel supply also have been provided.

Our invention is concerned with a fuel feeding means which is adapted to remain' inoperative until the predetermined vacuum has been attained, and to the .end of a simple, effective and reliable means, we provide a direct passage from the float or secondary storage chamber to the mixing chamber or air passage connected directly therewith. So that this feeding device may remain 1n- -operative until the proper time, I provide a` shunt or parallel path of sufficiently low resistance, which shunt must be first satisfied in order that the fuel itself may respond.

Our invention is illustrated in the accompanying drawings in which* The figure is a side elevational view of the carbureter.

The main structural supporting unit is in the form of a casting 6 which may be considered as being divided into three partsthe main mixing chamber 7, the auxiliary air inlet chamber 8 and the oil inlet'uchamber. 9, the three parts conveniently having thelrf axes in a single plane. The -main mixing chamber 7 is supplemented downwardly by. an extension 10 which has a central passageway of double conical cross-section. commonly ycalled a Venturi tube. The extension 10 is screw-threaded externally for Specification of Letterslatent.

CARBURETER.

' with the sleeve 11 and shelf 12 and is supported therefrom by means of the spider 14. A circular wall 15, preferably of glass, is

lclamped between the shelf 12 and the body of the casting 6 so asto form an oil float chamber 16, suitable gaskets 17 and 18 being provided to make a tight compartment. The float chamber 16 is connected with the inside of the fuel tube 13 by means of the passageways 19, 1 9 in the spider 14. Disposed within the float chamber andv surrounding the sleeve 11, so as to be in axial alinement with the Venturi tube, is an annular float 20, the position of this ioat being subject to the amount of oil contained in the4 chamber. The float chamber 16 is connected with the fuel chamber 9 by means of a passageway 21 and the chamber 9 in turn is connected with a source of oil supply in the following manner: The fuel chamber 9 is provided with a double outlet boss 22, 23, a valve seat member 24 being disposed in the connecting passage between the boss chamber and the fuel chamber. The boss 22 is in axial alinement with the passage leading to the fuel chamber and with a valve to be described. This boss is closed however by the use of a plug 25'and it is provided Patented4 oct. 19, 1920( Applicationled March 6, 1911. Serial No. 612,683.

mostly for'structural purposes although, as will be evident to those skilled in the art,

the fuel could be led into this boss if the associated arrangement were so disposed that that would be convenient. The boss 23 is provided with a union 26 from which the pipe 27, leading to the oil supply, extends. A strainer 28 is disposed in the boss 23 so as to prevent impurities from clogging thil passage 29, leading to the boss chamber, and subsequent passages.

On the top of the casting 6, in axial alinement with the valve opening 30 in the valve seat member 24, a tubular boss 31 is provided and this boss is internally screwthreaded for the reception of a sleeve 32 in which a valve stem 33 is mounted. At the with a h`eadv34 between which and the sleeve 32 a helical spring 35 is disposed., this spring end of the Valve is" tapered for coperation with the tapered seat for the valve opening 30. The valve, and consequently the stem, 1s guided at the bottom by means of a suitable spider 37 carried by the valve seat member 24. At the top the stem `is provided with a cup 38 which surrounds the sleeve so as to protect the passage therethrough. The sleeve 32 carries the cup 39 which is knurled to make a thumb piece and which su-rrounds the boss 31. The outside of the cup 39 is provided with a plurality of notches 40 into any one of which a plunger 41, disposed in a socket 42 in the casing against the tension of a spring 43 may be disposed. It is clear that when the cup 39 is turned one way or the other the screw-threaded, relation between the sleeve 32 and the boss 31 willh result inthe vertical adjustment of the valve and that the plunger arran ement which has just been described will ho d the cup in any adjusted position with suflicient security.'

Within the fuel chamber 9 a lever 44 is mounted upon a pivot 45, one arm of this lever being bifurcated so as to engage the under side of the head 34 of thestem 33 and the other arm extending through the vpassageway 21 into the float chamber 16.

The end of the lever 44 within the float chamber has pivoted thereto at 46 a link 47 which is attached to the float 20. lt will now appear that the `oil used for fuel can enter the carbureter by way of the connection 27, passing through the opening 29 and yup through the valve opening 30. lt then flows over the side of the float chamber and down through the passageway 21. 1t will be seen that the weight of the float acts in opposition to the spring 35 and as the float rises this opposition will be removed and the spring' 35 willl tend to close the valve 36 to a greater or less extent. Vthen sufficient oil has entered the float chamber the valve can be closed entirely and when the float 'subsequently drops it is opened to admit more'oil.

The valve 36 can be operated manually by grasping the cup 38. An air inlet 52 is provided in the casing so that the fuel chamber 9 will be exposed to atmospheric pressure and the float chamber itself is connected with the interior of the fuel tube by means of the passageways 19, 19 as heretofore described.

The fuel tube 13 is provided at` the upper end with a nozzle 53 which terminates in the restricted zone of the Venturi tube. At the bottom this fuel tube is provided with the normally closed drain cock 54, and is externally screwthreaded for the reception of the priming cup 55. Vhen the float chamber is flooded, as heretofore described, the oil runs out'of the nozzle and drops down to this cup. As the air is drawnthrough the carbureter, then, this excess oil supply is volatilized and a rich mixture is secured for starting purposes.

The auxiliary air chamber 8 is provided with an upward opening in which a spider 56 is disposed, this spider having al number of inlet openings and having its inner edge inwardly beveled as indicated at 57 to form a valve seat. A valve member 58 is secured upon a valve stem 59 which is guided at the vthreaded engagement with the inside of a downwardly extending boss 62 on the main casting. A helical spring 63 surrounds the stem 59 and extends between the under side ofthe valve member 5S and the top of the sleeve 61. The sleeve has secured thereto a cup 64, which is knurled to form a 'thumb piece and is provided with a plurality of peripheral slots 65 into any one of which a plunger 66 mounted in a pocket 67 against the tension of a spring 68, may extend so as to hold it in any adjusted position. ltwill be seen that the manipulation of the cup 64 will result in a changein thetension of the spring 63. For convenience the pocket 6 7 .4 is formed in a screw 69 which. is mounted' in the main casting. Near the top of the valve stem 59 engagement with the boss 60. rJhe end of the stem 59 is screw-threaded for the recep tion of a nut 71 through which a cotter pin 72, which also passes through an opening in the stem, may extend to hold it in any ad-` a cup '70 is slipped thereover and has threaded loo and the arrangement is such that these.

springs do not come into playuntil after the spring 63 has been compressed to a predetermined extent. rThe springs 73, 7 3 are, thus called the high speed springs. The

lcup is knurled to forni a-thumb piece and is provided with a plurality of peripheral slots or grooves 74, 74 into any one of which a plunger 75 disposed in a socket 76 against the tension of a spring 77, may extend. Ilfhe pocket 76 is provided in a screw 78 which is threaded into the spider 56. v

Associated with the auxiliary air inlet is an auxiliary fuel feed device in the form of a nozzle 79 which extends through the casing wall from the float chamber int-o the auxiliary air chamber or substantially the mixing chamber proper. This nozzle is screwed in place and is locked in position` by means of a nut ,80. Extending down from the nozzle, to a point below'the normal Y level of the oil in the float chamber, is a tube 81. A vent 82 connects the nozzle passage with the atmosphere in the oat chamber.

'Until the engine has reached the predetermined speed the suction upon the auxiliary nozzle will be satisfied by the vent 82, and the oil in the tube 81 will not respond. When, however, the necessary suction is attained the oil will respond `and is volatilized by the rush of air through the auxiliary air chamber, the auxiliary air valve being adjusted to also respond to this suction.

In this way a simple, effective and `reliable device, for the purposes of a secondary feed, is secured;

The connection between the mixing cham-. ber of the carbureter and the engine is controlled by means of the usual throttle 83.

IVe claim as new and desire to secure by Letters Patent:

1. In a carbureter, a main member form-` ing a mixing chamber with an auxiliary air chamber on one side and a fuel chamber on the other, said member havin@ a downwardly extending tubular boss for the passage of air, a main fuel tube extending upwardly into said boss, a ioat chamber surrounding said boss, an automatically controlled opening for said auxiliary air chamber, a valve for controlling the admission of fuel to said fuel chamber, a float in said float chamber for controlling said last named valve, an auxiliary fuel feed leading` directly from said float chamber to the auxiliary air chamber, and a vent for said auxiliary feed in said float chamber above the level of the oil, said float chamber being connected with the atmosphere.

2. In a carbureter, a mixing chamber, a fuel chamber, a main air inlet, a main fuel inlet, an automatically controlled auxiliary inlet adapted to operate only upon the attainment of a predetermined suction in the mixing chamber` an auxiliary fuel feed leading from said fuel chamber to said mixing chamber, and a restricted permanent.

vent for said auxiliary feed which is of such size that it will meet the demand of suction in the mixing chamber until the predetermined point has been reached, when the fuel itself will respond.

3. In a carbureter for internal-combus tion engines, a casing providing a carbureting-chamber and having a Venturi tube cast integrally therewith and extending down wardly therefrom, said Venturi tube being externally screw-threaded, a tube screwed on to said Venturi tube and carrying an annular shelf, an annular wall surrounding said second-named tube and clamped be- 'a valve connected with the float for closing said opening to preserve the level of the fuel in the float chamber approximately constant, a primary fuel nozzle communicating with said chamber, a main air inlet located adjacent to said primary fuel nozzle, a tube extending into the float chamber between 'the Hoat and the outer Wallof the chamber,

said tube being threaded into the upper wall vof the float chamber and terminati-ng 1n a secondary fuel nozzle considerably above the A level of the liquid in the lioat chamber, a secondary air inlet, a passage for the air admitted through said last named inlet, said secondary fuel nozzle being located in said passage and being always open to the suction of the engine when the throttle valve is open.

5. In a carbureter,4 having an outlet adapted to communicate with the engine, a valve controlling said outlet, a float charnber having a fuel supply opening, a float in the chamber, a valve connected `with the float for closing said opening to preserve the level of the fuel in the float chamber approximately constant, a primary fuel nozzle communicating with said chamber, a main air inlet located adjacent to said primary fuel nozzle, a tube extending into the float chamber between the fioat and the wall of the chamber, said tube having an inwardly extending off-set portion and an enlarged portion extending from said off-set portion terminating in a secondary fuel nozzle conways open to the suction of the engine when the throttle valve is open.

In witness whereof, we hereunto subscribe our names, this 4th day of March, 1911.

JOHN S. GOLDBERG. RAYMOND M. ANDERSON.

Witnesses:

ARTHUR H. BoETTcI-IER, CHESTER R. HEMINGWAY. 

